How to extract data from multiple data files?

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jfrazie9
jfrazie9 2018-3-25
评论： dpb 2018-3-25
I have 250 files with various x, y and according times, t data for 55 individual points. I also have a boundary area that will be in accordance with the x and y data points. I am trying to figure out the time when points 16-20 of the 55 points meets the boundary area. How do I load all the data sets, extract those various values and compile them to have the 250 times that the paths interact with the boundary for the 5 of 55 points I am looking at?
Thanks!
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Guillaume
Guillaume 2018-3-25
Well, relatively straightforward depending on what intercepts the boundary actually mean mathematically.
Given boundary points A and B, what does C intercepts mean? C == A or C == B (within some tolerance maybe?) or C on the segment between A and B (within some tolerance?) or something else.
As usual giving numeric examples is more useful than imprecise wording.
dpb
dpb 2018-3-25
Imprecise for certain, agreed, G...but since I would presume it simply means to find the sequential entries from one to the next for which a set of points is within/without the (again presumed) enclosed area...if the definition is more complex, so may be the calculation, granted.

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dpb
dpb 2018-3-25
In broad strokes,
bdr=readtable('boundaryfilename.txt','delimiter','tab');
d=dir('*.txt'); % use appropriate wildcard to get proper subset of files
for i=1:length(d)
tab=readtable(d(i).name,'delimiter','space');
...
insert boundary crossing logic here...
...
end
The above will return the data in tables and presumes the first record is a valid variable name for the header and a format for the time that can be inferred; you ignored the previous responder's request for necessary information to tell you more specifically as we have no way of knowing how the data are encoded.
Blank-delimited files are notoriously poor choice; if there's any missing data at all you'll have serious issues; strongly suggest generating those files using .csv or also tab-delimited instead although if can be assured the files are properly formed can get by.

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